Absorbent article having a fastening system
An absorbent article can include a fastening system configured to attach the rear waist region to the front waist region to define a wear configuration of the absorbent article. The fastening system can include a primary fastening system and a secondary fastening system. The primary fastening system can include at least one primary first fastening component and a primary second fastening component. The secondary fastening system can include at least one secondary first fastening component and at least one secondary second fastening component. The absorbent article can further include a strip coupled to the outer cover. The strip can include the primary secondary fastening component. The at least one secondary first fastening component can be coupled to a first carrier.
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This application is a continuation-in-part application of U.S. patent application Ser. No. 13/953,380, filed Jul. 29, 2013, the entirety of which is incorporated herein for all purposes.
BACKGROUNDThe present disclosure relates generally to absorbent articles intended for personal wear, and more particularly to disposable absorbent articles having a fastening system for selectively fastening and refastening the article about the wearer.
Many absorbent articles intended for personal wear, such as diapers, training pants, feminine hygiene products, adult incontinence products, bandages, medical garments and the like are designed to be sufficiently absorbent to absorb moisture from liquid body exudates including urine, menses, blood, etc., away from the wearer to reduce skin irritation caused by prolonged wetness exposure. Diapers, as an example, are typically placed and secured on a wearer using a set of primary fastening tabs, such as adhesive tabs or mechanical (e.g., hook or loop) fastening system tabs, and left in place to absorb insults as well as to contain fecal waste.
For articles where the attachment is refastenable, such as diapers and some training pants, pop-opens (separation of the fasteners) can sometimes occur as a result of stresses placed on the attachment by movement of the wearer. For example, and particularly for absorbent articles employing only one fastening system, as an infant or other wearer of the absorbent article moves about (e.g., crawls, walks, runs, bends, etc.) the shear stress placed on the fastening system due to the infant's movement may cause fastening tabs or the like to loosen or even come unfastened completely, resulting in an absorbent article which tends to leak, sag, or fall off of a wearer.
Accordingly, some known absorbent articles comprise more than one fastening system and/or fasteners to reduce the likelihood of the article leaking, sagging, falling off the user, etc. For example,
In the longitudinal direction 12, the diaper 10 defines a front portion 16, a back portion 18, and a crotch portion 20 extending between and connecting the front portion and the back portion. The diaper 10 also includes a bodyside liner 30 (facing away from the view depicted in
The back portion 18 of the diaper 10 includes a pair of back ears, indicated generally at 22. Each ear 22 includes a primary first fastening component 24 as part of the primary fastening system used to secure the diaper 10 around the waist of a wearer. The primary fastening system also comprises a primary second fastening component 76 for selectively receiving and fastening to the primary first fastening components 24. For example, the diaper 10 can be selectively moved from an unfastened configuration (as seen in
The diaper 10 also includes a secondary fastening system comprising secondary first fastening components 26 and secondary second fastening components 78. For example, the illustrated diaper 10 comprises a pair of secondary first fastening components 26 as part of the front portion 16 of the diaper, with a secondary second fastening component 78 provided on each back ear 22. In such configurations, when the diaper 10 is moved to the wear configuration, the secondary first fastening components 26 engages the back portion 18 of the diaper (and more particularly, the secondary second fastening components 78 provided on the back ears 22) such that both the primary fastening system and the secondary fastening system secure the diaper around the waist of a wearer.
However, providing the secondary first fastening components 26 on the diaper 10 may pose drawbacks when the diaper is packaged or ultimately worn. For example, with respect to packaging, the diaper 10 may be folded when provided to an end user in a package as depicted in
When the diaper 10 is folded in the conventional manner described above, the secondary first fastening components 26 (which are disposed at or inward of the fold line 42) may be partially or fully disposed on an outside of the folded diaper (as illustrated in
Further, because in such a configuration the secondary first fastening components 26 are disposed on the outside of the diaper 10, the folded diaper may engage other diapers or other objects during a packaging process. For example, the diaper 10 may be folded as described and subsequently packaged via, e.g., an automated process, a machine line, a conveyor belt, an assembly line, or the like. When the secondary first fastening components 26 are provided on the outside of the folded diaper 10 as is depicted in
Some known diapers avoid such problems by disposing a pair of fastening components (similar to the depicted secondary first fastening components 26) at or near a corresponding side edge 28 of the diaper 10 such that it will ultimately be disposed on an inside of the diaper when folded as described above. However, when such fastening components are disposed at or near the corresponding longitudinal side edge 28, the secondary first fastening component 26 may be prone to engaging a portion the bodyside liner 30 or a containment flap (not shown) of the diaper 10 when in the folded state. This may lead to, e.g., delamination or tearing of the bodyside liner 30 or the containment flap when the diaper 10 is unfolded for use.
Further, in such configurations, one of the secondary first fastening components 26 may engage the bodyside liner 30 and/or a flap, with the other secondary first fastening component engaging the outer cover 32. Thus, when a user unfolds the diaper 10, the user must complete two steps. That is, the user must first separate a first of the secondary first fastening components 26 from the outer cover 32 of the diaper 10 (to unfold the diaper along the lateral fold line 44), and then would need to separate a second of the secondary first fastening components from the bodyside liner 30 and/or flaps (to unfold the diaper along the pair of longitudinal fold lines 42). Thus, in such configurations, the diaper 10 may be difficult to prepare when placing the diaper on a wearer (e.g., an infant).
For example, and returning to
Further, when the secondary first fastening components are disposed at the overlapping region, a first of the secondary first fastening components will be disposed below and overlapped by the front portion 16 of the diaper 10, with a second of the secondary first fastening components disposed on the part of the front portion of the diaper which overlaps the first of the secondary first fastening components and exposed to the outer cover 32. Thus, when folded along the lateral fold line 44, the first of the secondary first fastening components 26 will engage the bodyside liner 30 and/or the flap, while the second of the secondary first fastening components will engage the outer cover 32. Thus, during use, a user must first disengage the second of the secondary first fastening components 26 from the outer cover 32 to unfold the diaper 10 along the lateral fold line 44, and then must disengage the first of the secondary first fastening components from the bodyside liner 30 and/or the flap to unfold the diaper along the longitudinal fold lines 42. Thus, this configuration adds an unfolding step for the user as compared to diapers 10 in which both of the secondary first fastening components 26 engage, e.g., the outer cover 32.
Other known diapers thus attempt to diminish the problems discussed above by disposing the secondary first fastening components 26 outboard of fold lines 42 depicted in
However, because the secondary first fastening components 26 are disposed very near (and in some embodiments even abut) the longitudinal sides of the absorbent core 34, when the diaper 10 is folded the entirety of the secondary first fastening components may not be disposed on an inside of the folded diaper, or, alternatively, may be disposed inside the folded diaper but very near or adjacent to a longitudinally extending folded side of the folded diaper. More particularly, the inboard longitudinal edges of the secondary first fastening components 26 of the KC-Mexico diaper 10 (i.e., the longitudinal edges of the secondary first fastening components abutting the absorbent core 34) may be disposed very near, at, or even inside of the fold lines 42 and thus may be prone to being exposed outside of the folded diaper along the folded edges. Thus, the KC-Mexico diaper 10 suffers at least some of the deficiencies described above, including being prone to engaging other diapers, objects, packaging, etc., during manufacturing and packaging the diaper.
In addition, manufacturing of the diaper 10 such that the secondary first fastening components 26 are disposed on the primary second fastening component 76 prior to manufacturing of the diaper 10 can also lead to certain limitations in the preparation and processing of the primary second fastening component 76.
Still further, a stiffness or similar properties of the secondary first fastening components 26 may lead to discomfort or decreased mobility for a wearer of the diaper 10. For example, when wearing the diaper 10, an infant may crawl, walk, run, bend, etc., in such a manner that the front portion 16 of the diaper moves, bends, or otherwise deforms. Thus, if the secondary fastening system (and more particularly the secondary first fastening components 26 disposed on the front portion 16 of the diaper 10) is too stiff, the user may have decreased mobility as the front portion of the diaper may not be as readily deformed as if the secondary fastening system was omitted from the diaper. Further, a relatively stiff secondary fastening system may be uncomfortable to a wearer with the relatively unpliable secondary first fastening components 26 providing irritation when the wearer moves.
There is a need, therefore, for an improved fastening system provided on an absorbent article which provides for increased protection against leakage and secure attachment of the absorbent article without the associated discomfort and/or packaging and manufacturing drawbacks discussed above. There is also a need for an improved fastening system provided on an absorbent article which provides for efficiencies in processing and converting of raw materials of the absorbent article.
SUMMARYIn one embodiment, an absorbent article is provided that includes a longitudinal axis and a lateral axis. The absorbent article can include an absorbent assembly including a liquid impermeable outer cover, a liquid permeable top sheet, and an absorbent body disposed between the outer cover and the top sheet. The absorbent assembly can include a front waist region, a rear waist region, and a crotch region extending between the front waist region and the rear waist region. The absorbent article can include a pair of ears extending transversely outward from opposite sides of the absorbent assembly. The absorbent article can further include a fastening system configured to attach the rear waist region to the front waist region to define a wear configuration of the absorbent article. The fastening system can include a primary fastening system and a secondary fastening system. The primary fastening system can include at least one primary first fastening component and a primary second fastening component. The secondary fastening system can include at least one secondary first fastening component and at least one secondary second fastening component. The absorbent article can further include a strip coupled to the outer cover. The strip can include the primary secondary fastening component. The at least one secondary first fastening component can be coupled to a first carrier.
In another embodiment, an absorbent article is provided that includes a longitudinal axis and a lateral axis. The absorbent article can include an absorbent assembly including a liquid impermeable outer cover, a liquid permeable top sheet, and an absorbent body disposed between the outer cover and the top sheet. The absorbent assembly can include a front waist region, a rear waist region, and a crotch region extending between the front waist region and the rear waist region. The absorbent article can include a pair of ears extending transversely outward from opposite sides of the absorbent assembly. The absorbent article can further include a fastening system configured to attach the rear waist region to the front waist region to define a wear configuration of the absorbent article. The fastening system can include a primary fastening system and a secondary fastening system. The primary fastening system can include a pair of primary first fastening components and a primary second fastening component. The pair of primary first fastening components can include a left primary first fastening component and a right primary first fastening component. The secondary fastening system can include a pair of secondary first fastening components and a pair of secondary second fastening components. The pair of secondary first fastening components can include a left secondary first fastening component and a right secondary first fastening component. The pair of secondary second fastening components can include a left secondary second fastening component and a right secondary second fastening component. The absorbent article can include a strip coupled to the outer cover. The strip can include the primary second fastening component. The left secondary first fastening component can be coupled to a first carrier and the right secondary first fastening component can be coupled to a second carrier. The first carrier and the second carrier can be coupled to the outer cover.
In a further embodiment, an absorbent article is provided that includes a longitudinal axis and a lateral axis. The absorbent article can include an absorbent assembly including a liquid impermeable outer cover, a liquid permeable top sheet, and an absorbent body disposed between the outer cover and the top sheet. The absorbent assembly can include a front waist region with a front waist edge, a rear waist region with a rear waist edge, a crotch region extending between the front waist region and the rear waist region, a first longitudinal side edge, and a second longitudinal side edge opposite from the first longitudinal side edge. The first longitudinal side edge and the second longitudinal side edge can each extend from the front waist edge to the rear waist edge. The absorbent article can further include a fastening system configured to attach the rear waist region to the front waist region to define a wear configuration of the absorbent article. The fastening system can include a primary fastening system and a secondary fastening system. The primary fastening system can include at least one primary first fastening component and at least one primary second fastening component. The at least one primary second fastening component can be included on a strip coupled to the outer cover. The secondary fastening system can include at least one secondary first fastening component and at least one secondary second fastening component. The at least one secondary first fastening component can include an inner longitudinal side edge and an outer longitudinal side edge. The at least one second first fastening component can be directly coupled to the strip or directly coupled to a first carrier that is directly coupled to the strip. The outer longitudinal side edge of the at least one secondary first fastening component can be disposed outboard of the first longitudinal side edge of the absorbent assembly.
Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.
DETAILED DESCRIPTION OF THE DRAWINGSAccording to some aspects of the disclosure, an absorbent article is provided which overcomes at least some of the deficiencies of the conventional diapers described above. More particularly, according to some aspects of the disclosure, the absorbent article includes a secondary fastening system in order to securely attach the absorbent article around the waist of a wearer, but which comprises improved pliability over known fastening systems such that the absorbent article remains securely fastened even as the wearer crawls, walks, runs, bends, etc. The secondary fastening system may be constructed of suitable materials and disposed in a suitable position relative to other components of the absorbent article such that the absorbent article may be readily packaged or used without the drawbacks of the known diapers discussed above.
These features will become more apparent with reference to the accompanying drawings.
In one suitable embodiment, the diaper 110 is a disposable absorbent article. As used herein, the term “disposable absorbent article” refers to articles which absorb and contain body exudates and which are intended to be discarded after a limited period of use. The articles are not intended to be laundered or otherwise restored for reuse. The articles can be placed against or in proximity to the body of a wearer to absorb and contain various exudates discharged from the body. It is understood that in other suitable embodiments, the diaper 110 can be reusable. That is, the diaper 110 can be intended for multiple uses without departing from some aspects of this disclosure.
In the longitudinal direction 112, the diaper 110 defines a front portion 116, a back portion 118, and a crotch portion 120 extending between and connecting the front portion and the back portion. The diaper 110 includes a bodyside liner 130, an outer cover 132, and an absorbent core 134 located between the bodyside liner and the outer cover. The bodyside liner 130, outer cover 132 and absorbent core 134 collectively define an absorbent assembly. The absorbent assembly can be any suitable shape including, for example, generally I-shaped as illustrated in
In the illustrated embodiment, the back portion 118 includes a straight back waist edge 138 and the front portion 116 includes a straight front waist edge 140. As used herein, “straight edge” refers to edges that are substantially free from curves, bends, angles, notches, or irregularities. It is understood, however, that the back waist 138 and the front waist 140 may be cut in any suitable shape as are known in the art (e.g., arcuate). As seen in
The bodyside liner 130 of the diaper 110, as illustrated in
The outer cover 132 of the diaper 110, which is illustrated in
The bodyside liner 130 and the outer cover 132 are generally joined in facing relationship with the absorbent core 134 located therebetween. The bodyside liner 130 and the outer cover 132 can be joined to each other around the outer periphery of the diaper 110 by any means known to those skilled in the art such as adhesive bonds, ultrasonic bonds, thermal bonds, and the like, and combinations thereof. As used herein, the term “join”, and derivatives thereof, encompass configurations wherein an element is directly secured to the other element by affixing the element directly to the other element, and configurations wherein the element is indirectly secured to the other element by affixing the element to intermediate member(s) which in turn are affixed to the other element.
As mentioned above, the absorbent core 134 is positioned between the bodyside liner 130 and the outer cover 132. The absorbent core 134 is generally conformable and capable of absorbing and retaining liquid body exudates. The absorbent core 134 can include superabsorbent material, staple fibers, binder fibers, and the like, and combinations thereof as is known in the art. The absorbent core 134 may have any of a number of shapes and sizes. For example, the composite absorbent core 134 may be rectangular, I-shaped, or T-shaped. The size and absorbent capacity of the absorbent core 134 should be compatible with the size of the intended wearer and the fluid loading imparted by the intended use of the diaper.
In one suitable embodiment, the diaper 110 may include a surge portion (not shown) disposed between the absorbent core 134 and the bodyside liner 130. The surge portion serves to quickly collect and temporarily hold liquids discharged by the wearer and then release the liquids to the absorbent core 134. Various woven and nonwoven materials can be used to construct the surge portion. For example, the surge portion may be a layer of a spunbonded or meltblown web of polyolefin fibers. The surge portion may also be a bonded carded web of natural and synthetic fibers. The surge portion may be a substantially hydrophobic material and, optionally, can be treated with a surfactant or otherwise to impart a desired level of wettability and hydrophilicity.
The diaper 110 includes a pair of elasticized, longitudinally-extending leg cuffs 136. The leg cuffs 136 are adapted to fit about the legs of a wearer in use and serve as a mechanical barrier to the lateral flow of body exudates. In one suitable embodiment, the leg cuffs 136 can be formed by portions of the outer cover 132, and/or bodyside liner 130, which extend beyond the longitudinal sides of the absorbent core 134. In another suitable embodiment, the leg cuffs 136 can be formed from separate materials (e.g., stands of leg elastics) joined to the outer cover 132 and/or the bodyside liner 130.
The diaper 110 may further include a front waist elastic (not shown) and/or a back waist elastic 146. In the illustrated embodiment, for example, the diaper 110 has a back waist elastic 146 but not a front waist elastic. The back waist elastic 146 is arranged to draw and hold the diaper 110 against the wearer, particularly against the waist of the wearer, as will be more fully discussed.
Materials suitable for use in forming leg cuffs 136 and/or waist elastics 146 are known to those skilled in the art. Examples of such materials are strands or ribbons of a polymeric, elastomeric material which are adhered to the diaper 110 in a stretched position, or which are attached to the diaper while the diaper is pleated, such that elastic constrictive forces are imparted to the diaper. The leg cuffs 136 and/or waist elastics 146 may have any configuration which provides the desired performance. The leg cuffs 136 may be generally straight or optionally curved (as illustrated in
The leg cuffs 136 and/or waist elastics 146 may be attached to the diaper 110 in any way known to those skilled in the art. For example, the leg cuffs 136 and/or waist elastics 146 may be joined to the diaper 110 by ultrasonic bonding, thermal bonding, adhesive bonding, and the like, and combinations thereof.
The diaper 110 may also include a pair of containment flaps (not shown) that extend longitudinally along the diaper and are adapted to provide a barrier to the lateral flow of body exudates. The containment flaps can be connected to the bodyside liner 130 or other components as is well known in the art. Suitable configurations of the containment flaps 148 are described, for example, in U.S. Pat. No. 5,599,338 issued Feb. 4, 1997, to K. Enloe, the entirety of which is incorporated herein by reference.
As seen in
In one suitable embodiment, each of the back ears 122 includes an elastomeric portion 150, a non-elastomeric portion 152, and a primary first fastening component 124 mounted to the non-elastomeric portion (
In the embodiment illustrated in
Both the upper and lower edges 158, 160 have first segments 162 that are generally parallel to each other and generally perpendicular to the respective proximal edges 154. Each of the first segments 162 generally correspond to the part of each of the elastomeric portions 150 that overlap the bodyside liner 130. In the illustrated embodiment, the first segments 162 of the upper edges 158 of the elastomeric portion 150 are spaced from the back waist edge 138. It is understood, however, that the first segments 162 can be aligned with the back waist edge 138 of the diaper 110.
Second segments 164 of each of the upper and lower edges 158, 160 are generally coaxial and extend towards each other generally perpendicular to the first segments 162. In the illustrated embodiment, the second segment 164 of the lower edge 160 has a length greater than the length of the second segment of the upper edge 158. It is understood, however, that the second segments 164 of the upper and lower edges 158, 160 can have any suitable length.
Each of the illustrated elastomeric portions 150 includes an arcuate third segment 166 interconnecting the second segments 164 to the respective distal edge 156. In the illustrated embodiment, the third segments 166 are generally mirror images of each other. It is understood, however, that the third segments 166 can have any suitable shape and that the third segments of the upper edges 158 can have a shape that is different that the shape of the third segments of the lower edges 160.
The elastomeric portions 150 of the back ears 122 can be formed from any type of elastomeric material capable of performing as described herein. In one suitable embodiment, the elastomeric material will be stretchable in at least one direction (e.g., in the lateral direction 114 of the diaper 110 as viewed in
In one suitable embodiment, the elastomeric material from which the elastomeric portions 150 of the back ears 122 are formed is capable of being elongated by at least about 50 percent, alternatively by at least about 100 percent, alternatively by at least about 130 percent. After elongation to 50 percent (if the elastomeric material is capable of being elongated to no more than 100 percent) or 100 percent (if the elastomeric material is capable of being elongated to more than 100 percent), the elastomeric material suitably recovers to at least about 50 percent of its original length, alternatively to at least about 80 percent of its original length. The elastomeric material may be an inherently elastomeric material, that is, one which is formed in an elastomeric state, or may be rendered elastomeric through processing subsequent formation. For example, the elastomeric material may be heat or pressure activated. The elastomeric portions 150 of the back ears 122 can be formed from a stretch-bonded-laminate (SBL) material, a neck-bonded-laminate (NBL) material, an elastomeric film, an elastomeric foam material, or the like.
Each of the non-elastomeric portions 152 of the back ears 122 is attached to a respective one of the elastomeric portions 150, and the primary first fastening components 124 (such as a hook material) are in turn disposed on the non-elastomeric portions. As illustrated in
As seen best in
The diaper 110 can be selectively moved from the unfastened configuration, as illustrated in
According to some embodiments, the article fastening system 170 comprises a primary fastening system and a secondary fastening system. The primary fastening system comprises the primary first fastening components 124 disposed on the non-elastomeric portions 152 of the back ears 122 and at least one corresponding primary second fastening component 176 which is adapted for refastenable engagement to the primary first fastening components. In one suitable embodiment, an outer surface of each of the primary fastening components 124, 176 comprises a plurality of engaging elements. More specifically, the engaging elements of the primary first fastening components 124 are adapted to repeatedly engage and disengage corresponding engaging elements of the primary second fastening components 176 to releasably secure the diaper 110 in its wear configuration.
The primary fastening components 124, 176 may comprise any refastenable fasteners suitable for absorbent articles, such as adhesive fasteners, cohesive fasteners, mechanical fasteners, or the like. In one suitable embodiment, the primary fastening components 124, 176 comprise mechanical fastening components, such as hook and loop fasteners. For example, suitable hook and loop components can be provided by interlocking geometric shaped materials. As used herein, “hook” broadly refers to any suitable mechanical fastener adapted to engage loop components including, e.g., hooks, bulbs, mushrooms, arrowheads, balls on stems, stems, structures having stems that engage foam such as open cell foam or the like, etc. Other suitable mechanical fastening components include male and/or female mating components, buckles, snaps, or the like. In the illustrated embodiment, the primary first fastening components 124 comprise hook fasteners and the primary second fastening components 176 comprise a complementary loop fastener disposed on the outer surface of the outer cover 132. Alternatively, the primary first fastening components 124 may comprise loop fasteners and the primary second fastening components 176 may comprise complementary hook fasteners.
The shape, density, and polymer composition of the hooks and loops may be selected to obtain the desired level of engagement between the primary fastening components 124, 176. A more aggressive hook material may comprise a material with a greater average hook height and/or a greater percentage of directionally-aligned hooks.
In some embodiments, the outer facing surface of the outer cover 132 of the diaper 110 is suitably constructed to define the primary second fastening component 176, which is a loop fastener. That is, the outer cover 132 itself can be formed of a material that defines the primary second fastening component 176 (e.g., vertical filament laminate (VFL) or other suitable material).
In another suitable embodiment, and as illustrated in
The secondary fastening system of the article fastening system 170 comprises secondary first fastening components 126 and secondary second fastening components 178. The secondary first fastening components 126 are disposed on the front portion 116 of the diaper 110 and are adapted for refastenable engagement to at least one corresponding secondary second fastening component 178 (e.g., the elastomeric portion 150 of the back ears 122). As best seen
In the illustrated embodiment, the secondary first fastening components 126 comprise hook fasteners and are configured to engage the secondary second fastening components 178 in the wear configuration of the diaper 110. Again, as used herein “hook” fasteners refers broadly to any suitable mechanical fastener adapted to engage loop components including, e.g., hooks, bulbs, mushrooms, arrowheads, balls on stems, stems, structures having stems that engage foam such as open cell foam or the like, etc. In one embodiment, the secondary first fastening components 126 may be constructed of polyethylene or other suitable polymer blends. In one suitable embodiment, the elastomeric portions 150 of the back ears 122 are constructed so at least the inner surfaces of the elastomeric portions define the secondary second fastening components 178 in the form of loop fastening components (i.e., the elastomeric portions and the respective secondary second fastening components are formed integrally). The elastomeric portions 150 in one suitable embodiment can be constructed of NBL material so that the elastomeric portions itself defines a loop fastening component. In another suitable embodiment, the elastomeric portions 150 can be constructed of VFL material so that the elastomeric portions itself defines a loop fastening component. It is understood, however, that the secondary second fastening components 178 may be formed separate from the elastomeric portions 150 and attached thereto, such as by adhesive, thermal bonds, ultrasonic bonds, pressure bonds, or other suitable techniques without departing from the scope of this disclosure.
In other suitable embodiments, the secondary first fastening components 126 may comprise loop fasteners and the secondary second fastening components 178 may comprise loop fasteners. Further, in some embodiments the secondary first fastening components 126 may be a single, integral fastener. For example, in one suitable embodiment the secondary first fastening components 126 may be a single, loop fastener, and the secondary second fastening components 178 may be loop fasteners.
In one suitable embodiment, the strip 180 comprising both the secondary first fastening components 126 and the primary second fastening component 176. In one such embodiment where the primary second fastening component 176 comprises a loop material and the secondary first fastening component 126 comprises a hook material, the strip 180 may be a suitable loop material (forming the primary second fastening component), and then the hook material may be extruded onto the loop material at two or more locations forming the secondary first fastening components.
In another suitable embodiment, the secondary first fastening components 126 can be formed separate from the primary second fastening component 176. In such an embodiment, the primary second fastening component 176 can be formed to define the strip 180 and the secondary first fastening components 126 can be attached in overlaying relationship with portions of the primary second fastening component. In such embodiments, the secondary first fastening components 126 may be attached to the strip 180 and/or the primary second fastening component 176 using any suitable means known to those skilled in the art, including, e.g., adhesive bonds, ultrasonic bonds, thermal bonds, pressure bonds, and the like, and combinations thereof.
In some embodiments, the secondary first fastening components 126 may be attached to the diaper 110 and/or the strip 180 after the strip has been attached to the diaper 110. For example, in one suitable embodiment the strip 180 may be first bonded to the diaper 110 using any suitable means as discussed, and then the secondary first fastening components 126 may be bonded to or extruded on the strip. In other embodiments, the strip 180 comprising both the secondary first fastening components 126 and primary second fastening components 176 can be attached to the diaper 110 as one single unit.
According to some embodiments, the secondary first fastening components 126 and/or the strip 180 may be sufficiently bonded to the diaper 110 such that a shear force exerted on the secondary first fastening components and/or the strip during use of the diaper does not cause the secondary first fastening components and/or the strip to loosen or completely disengage from the diaper. For example, in some embodiments an improved adhesive or the like can be used such that the secondary first fastening components 126 and/or the strip 180 remain securely fastened to, e.g., the outer cover despite the forces exerted on the fastening system 170 during use. In such embodiments, the diaper 110 may be less prone to pop-opens and the edges of the secondary first fastening components 126 and/or the strip 180 may remain flush with the outer cover 132 thus reducing irritation during wear which may otherwise be caused by a loose secondary first fastener and/or a loose strip.
When the diaper 110 is moved to the wear configuration with the primary fastening components 124, 176 engaging one another, the secondary fastening components 126, 178 may also engage one another in order to provide increased stability and leakage protection. For example, because the article fastening system 170 comprises four engagement points, the diaper 110 will be less prone to pop-opens when worn. Further, because the secondary fastening components 126, 178 engage each other closer to a side of a wearer than an engagement point of the primary fastening components 124, 176, the secondary fastening system secures the diaper 110 nearer the wearer's sides and legs thus reducing leakage near the leg openings 174 of the diaper. Still further, and again because the secondary fastening components 126, 178 engage each other near a side of the wearer, the secondary fastening system may provide increased stability, thus reducing the occurrence of, e.g., sagging of the diaper due to movement of the wearer.
In some embodiments, an appearance of the secondary first fastening component 126, the secondary second fastening component 178, and/or the back ears may be configured to provide suitable visual cues to a user for attaching the diaper 110 to a wearer. For example, in some embodiments, a coloring of the secondary first fastening components 126 may be such so as to, e.g., increase the noticeability of the secondary first fastening components on the front portion 116 of the diaper 110. For example, each of the secondary first fastening components 126 may be configured as a different color than its immediate surroundings such that it stands out from its immediate surroundings. Similarly, a graphic, background pattern, etc., may be removed from the area surrounding the secondary first fastening components 126 to increase the noticeability of each component. Still further, an area on the front portion 116 of the diaper 110 where a corresponding secondary first fastening component 126 attaches may be provided with a different graphic or coloring, etc., than its surrounding, and the secondary first fastening components can correspondingly be constructed of a transparent or semi-transparent material such that, when the secondary first fastening component is provided on the front portion by any suitable means discussed herein, the different coloring, graphical properties, etc., are visible through the secondary first fastening component thus increasing the noticeability of the secondary first fastening components on the front portion.
In still further embodiments, the opacity of the pair of back ears 122 and/or the secondary second fastening component 178 may be configured such that each secondary first fastening component 126 is visible through a respective one of the ears 122 when the diaper 110 is in the wear configuration. For example, in some embodiments the back ears 122 and/or the secondary second fastening components 178 may be transparent or semi-transparent. In such embodiments, the secondary first fastening components 126 may be visible through the back ears 122 when the diaper is in the wear configuration so that a user may be provided with a visual indication of the engagement of each secondary first fastening component with the respective secondary second fastening component 178. In some embodiments, these visual cues (i.e., the coloring or graphical properties of the secondary first fastening component 126 and/or the opacity of the secondary second fastening component 178) may assist a user engaging the secondary fastening system and/or in ensuring the secondary fastening system is properly engaged in the wear configuration.
According to some aspects, the secondary first fastening components 126 may be disposed on the front portion 116 of the diaper 110 at a position relative to the absorbent core 134, longitudinal fold lines 142, and/or the longitudinal side edges 128 such that the secondary first fastening components are provided on an inside of the diaper when folded and such that the secondary first fastening components engage the outer cover 132 and/or the back ears 122 of the diaper when the diaper is folded, the benefits of which will be discussed more fully. This may be more readily understood with reference to
The depicted folding process of
In the second folding step 191, the folded over back ears 122 are then again folded onto the absorbent components of the diaper 110 (i.e., the folded over ears are folded over the main body generally at a location of the longitudinal side edges 128). At such a step, portions of the folded over back ears 122 may further overlap portions of the bodyside liner 130. In one suitable embodiment, no portions of the back ears 122 will engage the bodyside liner 130 following the second folding step 191 since the primary first fastening components 124 are engaged with the respective secondary second fastening components 178.
Also at the second folding step 191, the front portion 116 of the diaper 110 is folded such that the longitudinal edges of the front portion overlap one another near a center line 198 of the diaper. More particularly, a first of the two longitudinal edges 128 of the diaper 110 is folded toward the bodyside liner 130 of the diaper such that the first longitudinal edge extends past the center line 198 of the diaper, with the second of the two longitudinal edges then folded over in a similar manner to form an overlap region 196 near the center line of the diaper. At the overlap region 196, a rightmost and leftmost portion of the front portion 116 of the diaper 110 overlap one another with a portion of the bodyside liner 130 abutting a portion of the outer cover 132 (as viewed in
In the third folding step 192, the back portion 118 of the diaper is folded over in a similar manner to the front portion 116 as folded in step 191. More particularly, a first of the two longitudinal edges 128 at the back portion 118 of the diaper 110 is first folded toward the bodyside liner 130 of the diaper 110 such that the first longitudinal edge extends past the center line 198 of the diaper, with the second of the two longitudinal edges then folded over in a similar manner to form the overlap region 196 near the center line 198 of the diaper where a rightmost and leftmost portion of the back portion 118 of the diaper overlap one another (as viewed in
As seen in
At the fifth folding step 194, the diaper 110 is folded at or near a lateral fold line 144 such that the back waist edge 138 is generally aligned with the front waist edge 140 in the folded state (as depicted in
In the second folding step 291, the folded over back ears 122 are folded towards the outer cover 132 of the diaper 110 (i.e., the folded over ears away from the view depicted in
Also at the second folding step 291, the front portion 116 of the diaper 110 is folded such that the longitudinal edges of the front portion overlap one another near a center line 198 of the diaper in a substantially similar manner as in folding step 191.
In the third folding step 292, the back portion 118 of the diaper is folded over in a similar manner to the front portion 116 as folded in step 291. More particularly, a first of the two longitudinal edges 128 at the back portion 118 of the diaper 110 is first folded toward the bodyside liner 130 of the diaper 110 such that the first longitudinal edge extends past the center line 198 of the diaper, with the second of the two longitudinal edges then folded over in a similar manner to form the overlap region 196 near the center line 198 of the diaper where a rightmost and leftmost portion of the back portion 118 of the diaper overlap one another (as viewed in
As seen in
At the fifth folding step 294, the diaper 110 is folded at or near a lateral fold line 144 such that the back waist edge 138 is generally aligned with the front waist edge 140 in the folded state (as depicted in
In one suitable embodiment, the folded and stacked diapers 110 (following, e.g., either suitable folding process described above) can be placed into suitable flexible packaging to define a compressed package. By “compressed package” it is meant a package that contains a plurality of diapers 110 wherein the plurality of diapers have a pre-insertion dimension, measured along at least one axis, which is greater in length than when the plurality of diapers are contained in the packaging. For example, if fourteen diapers 110 are assembled into a row having a pre-insertion dimension, measured along an axis, e.g., the x axis, of 10 inches (254 mm) and the row of diapers are then compressed by a force of at least 1 pound to a dimension of less than 10 inches (254 mm) when they are contained in the packaging, then the articles are considered to be contained in a compressed package. More specifically, the diapers 110 can be compressed and inserted into the packaging. After the diapers 110 are placed in the packaging, the packaging is sealed. The compressed diapers 110 try to expand from their compressed configuration to an uncompressed configuration within the sealed packaging. The cumulative expansion efforts of the diapers 110 place the packaging under tension. Suitably, the compressed diapers 110 apply between about 1 pound and about 20 pounds of force against the packaging (i.e., an in-bag force), and more suitably between about 7 pounds and about 12 pounds. In one suitable embodiment, the diapers 110 apply about 9 pounds of force against the packaging 11.
As a result of such a folding process depicted in
Further, and because each secondary first fastening component 126 is offset a sufficient distance from a corresponding longitudinal side edge 128, the secondary first fastening components will not engage the bodyside liner 130 when the diaper 110 is in the folded configuration. This may be more readily understood with reference to
Each secondary first fastening component 126 is spaced a sufficient distance from a corresponding longitudinal side edge 128 such that neither secondary first fastening component is located in the overlap region 196 following the fourth folding steps 193, 293. Accordingly, when the diaper 110 is further folded in the fifth folding steps 194, 294 (i.e., folded along lateral fold line 144 to the folded configuration depicted in
More particularly, if folded according to the process depicted in
Disposing each secondary first fastening component 126 at a position such that it is located inside of the folded diaper 110 (as depicted in
Further, and because the secondary first fastening components 126 may be disposed outboard of the overlap region 196 following the fourth folding step 193 in some embodiments (i.e., the rightmost secondary first fastening component is disposed in the right region 197 and the leftmost secondary first fastening component is disposed in the left region 195) the secondary first fastening components will preferably not engage the bodyside liner 130 and/or a containment flap (not shown) of the diaper 110 when the diaper is in the folded configuration (
Still further, and again because the secondary first fastening components 126 may preferably be provided in the outboard regions (i.e., left region 195 and right region 197) of the overlap region 196 following the fourth folding step 193, both secondary first fastening components will engage the outer cover 132 or the back ears 122 when the diaper 110 is folded along lateral fold line 144 in the fifth folding step 194. Thus, the diaper 110 will be more readily kept in the folded state (
In some embodiments, the folded and stacked diapers 110 may be placed into suitable flexible packaging to define a compressed package (as discussed). In such embodiments, the tension which the folded and stacked diapers 110 applies against the packaging (i.e., the in-bag force) may facilitate the engagement of the secondary first fastening components 126 with the outer cover 132. More particularly, the in-bag force may compress the secondary first fastening components 126 against the outer cover 132 such that most or all of the surface area of the secondary first fastening components engage the outer cover. In such embodiments, the folded diaper 110 may more readily remain in the folded configuration once removed from the packaging, etc., due to the engagement of the secondary first fastening components 126 with the outer cover 132.
One suitable placement of the secondary first fastening components 126 in relation to other components of the diaper 110 in order to achieve one or more of the described benefits may be more readily understood with reference to
In some embodiments, a ratio of L2:L1, L2:L3, and/or L1:L3 may be appropriately configured such that the diaper 110 exhibits one or more benefits described. For example, in some embodiments the ratio of L2:L1 and L2:L3 may be appropriately configured so, when folded, the secondary first fastening components 126 are provided on an inside of the diaper 110 and outboard of the overlap region 196 such that the secondary first fastening components are not externally exposed and such that the secondary first fastening components engage the outer cover 132 or the back ears 122 (and not a bodyside liner 130) of the folded diaper.
For example, in some embodiments, the diaper may be constructed such that the ratio of L2:L1 (i.e., the ratio of a distance from the center line 198 to an inboard edge of the secondary first fastening component 126 compared to a distance from the center line to the outer edge 128 of the front portion 116 of the diaper 110) is at least 0.50 and is less than 1.00. Preferably, the diaper 110 may be constructed such that the ratio of L2:L1 is between 0.50 and 0.80, and more preferably between 0.50 and 0.70, and even more preferably between 0.50 and 0.65.
Further, in some embodiments, the diaper 110 may be constructed such that the ratio of L2:L3 (i.e., the ratio of the distance from the center line 198 to the inboard edge of the secondary first fastening component 126 compared to a distance from the center line to an outer edge of the absorbent core 134) is greater than 1.15. Preferably, the diaper 110 may be constructed such that the ratio of L2:L3 is between 1.15 and 1.80, and more preferably between 1.15 and 1.70, and even more preferably between 1.15 and 1.60.
Another suitable placement of the secondary first fastening components 126 in relation to other components of the diaper 110 in order to achieve one or more of the described benefits may be more readily understood with reference to
As shown in
For example, in some embodiments the diaper 110 may be constructed such that an inner region boundary, H (i.e., an inboard side of the lateral region G) is disposed from the center line 198 a distance equal to the distance from the center line 198 to the longitudinal fold line 142, C, plus 6 millimeters (i.e., H=C+6 mm). Further, the lateral region, G, may be defined as having a width equal to two times the distance from the center line 198 to the longitudinal fold line 142, C, less the distance from the longitudinal fold line to the side edge 128 at the front portion 116, F, less 6 millimeters (i.e., G=2*C−F−6 mm). Accordingly, the diaper 110 may be constructed such that the outer region boundary, J (i.e., an outboard side of the lateral region, G) is disposed from the center line 198 a distance equal to the distance from the center line 198 to the longitudinal fold line 142 plus 6 millimeters, H, plus the width of the lateral region, G (i.e., J=H+G). In embodiments where the distance from the center line 198 to the longitudinal fold line 142 plus 6 millimeters, H, plus the width of the lateral region, G, is greater than the distance from the center line to the side edge 128 at the front portion 116, A, less 6 millimeters, the outer region boundary, J, may alternatively be defined as the distance from the center line to the side edge at the front portion, A, less 6 millimeters (i.e., J=A−6 mm).
In other suitable embodiments, the inner region boundary, H (i.e., an inboard side of the lateral region G) may be defined according to a relative location of the longitudinal fold lines 142 to the longitudinally extending center line 198. For example, in embodiments where the longitudinal fold lines 142 are disposed very near or even within the absorbent core 134, a inboard-most longitudinal edge of the secondary first fastening components 126 may need to be spaced further outboard so that the secondary first fasteners will be folded within the diaper 110 than in embodiments where the longitudinal fold lines are spaced farther apart from the absorbent core. That is, because the absorbent core 134 may have a non-negligible thickness, in embodiments where the longitudinal foldlines 142 are very near or within the absorbent core, when the diaper 110 is folded along the longitudinal fold lines the diaper wraps around the thickness of the absorbent core. Thus, the secondary first fastening components 126 may need to be spaced from the longitudinal fold lines 142 a distance equal to the thickness of the absorbent core 134 plus a predetermined process range to ensure the secondary first fastener is sufficiently included within the folded diaper 110. However, when the longitudinal fold lines 142 are spaced farther away from the absorbent core 134, the diaper 110 does not wrap around the thickness of the absorbent core at a location of the fold lines, and thus the inboard-most edge of the secondary first fastening components 126 may be disposed nearer the fold lines and still be entirely disposed within the diaper in the folded state.
This may be more readily understood with reference to
However, when the fold lines 142 are disposed nearer the absorbent core 134, as depicted in
In still other embodiments, and as best viewed in
In any embodiment, the outer region boundary, J (i.e., an outboard side of the lateral region, G) can be defined generally as less than the distance from the center line 198 to the side edge 128 at the front portion 116, A (i.e., J<A). That is, placing the secondary first fasteners 126 at the longitudinal edge 128 of the diaper 110 may, e.g., cause the secondary first fasteners to engage an undesirable location of the folded diaper (as discussed), may cause irritation to a wearer (because, e.g., each fastener may rub against the wearer's leg during wearing of the diaper), and/or may interfere with a bonding of the bodyside liner 130 and the outer cover 132 at a perimeter of the diaper. Thus, the outer region, J, of the lateral distance, G, may be sufficiently spaced apart from the longitudinal side 128 of the diaper 110 (i.e., J<A) such that one or more of these drawbacks may be eliminated. For example, in some embodiments, the outer region, J, may be defined as the distance from the center line 198 to the side edge 128 at the front portion 116, A, less six millimeters (i.e., J=A−6 mm). In other embodiments, the outer region, J, may be defined as the distance from the center line 198 to the side edge 128 at the front portion 116, A, less ten millimeters (i.e., J=A−10 mm). In still other embodiments, the outer region, J, may be defined as the distance from the center line 198 to the side edge 128 at the front portion 116, A, less fifteen millimeters (i.e., J=A−15 mm) or even less twenty millimeters (i.e., J=A−20 mm) or even less twenty-five millimeters (i.e., J=A−25 mm).
In one suitable embodiment, a distance from the center line 198 to the side edge 128 at the front portion 116, A, may preferably be in a range of 100 millimeters to 175 millimeters. Further, inner region boundary, H (i.e., an inboard side of the lateral region G) may be greater than 58.5 mm, and less than 70.5 mm. Preferably, the inner region boundary, H, may be greater than 60.0 mm and less than 65.0 mm, and even more preferably greater than 61.0 mm and less than 62.0 mm. Further, the outer region boundary, J (i.e., an outboard side of the lateral region, G) may be greater than 81.5 mm and less than 99 mm. Preferably, the outer region boundary, J, may be greater than 85 mm and less than 90 mm, and even more preferably greater than 86 mm and less than 88 mm.
Accordingly, for a given diaper 110 with known dimensions of various components (e.g., a distance from a center line 198 of the diaper to the edge of the absorbent core 134, the longitudinal fold line 142, the edge of the diaper 128, etc.) an appropriate lateral region for positioning the secondary first fastening component 126 may be readily determined. When the secondary first fastening component 126 is disposed in this region (i.e., when disposed in the lateral region, G, as depicted in
Turning now to
More particularly, in the embodiment depicted in
However, in this embodiment, each of the secondary first fastening components 126 are provided on a corresponding carrier 202 which is then attached to or otherwise provided on the outer cover 132. As with the embodiment depicted in
However, in this embodiment, each of the secondary first fastening components 126 are provided on a corresponding carrier 302 which is then attached to or otherwise provided on the outer cover 132. Further, in this embodiment, outer edges 386 of a strip 380 (which includes primary second fastening component 176) overlap and attach to the carriers 302. That is, the innermost longitudinal edge 304 of each carrier 302 is disposed inboard of a corresponding outer edge 386 of the strip 380. In such embodiments, the carriers 302 may be embedded or otherwise provided to the outer cover 132 of the diaper with the strip 380 overlapping and attached to each of the carriers at a location near the outer edges 386 of the strip 380. The outermost longitudinal edge 306 of each carrier 302 can be disposed outboard of the corresponding outer edge 386 of the strip 380.
Providing the secondary first fastening components 126 on carriers 202, 302 (such as shown in
Providing the secondary first fastening component 126 on a carrier 202, 302 that does not form the strip 280, 380 comprising the primary second fastening component 176 can provide advantages in the cost of processing and converting the secondary first fastening component 126 on the carrier 202, 302 in roll form as compared to the cost of processing and converting the secondary first fastening component 126 when the secondary first fastening component 126 is on the strip 180. In one example, the secondary first fastening component 126 can comprise hook material that is extruded on to a carrier material, whether it be the carrier 202, 302, or the strip 180. If the hook material that forms the secondary first fastening components 126 is extruded directly on to the material that will form the strip 180, the hook material forming the secondary first fastening components 126 must be extruded a specified distance apart such that when cut and placed on the diaper, as will be discussed in more detail below, the pair of secondary first fastening components 126 are in a desired location on the front waist region 116 of the diaper 110. However, if the hook material that forms the secondary first fastening components 126 is extruded directly on to material that will form the carriers 202, 302, then the hook material forming the secondary first fastening components 126 can be extruded much closer together on the material that will form the carriers 202, 302 because the distance between the secondary first fastening components 126 on the front waist region 116 of the diaper 110 is controlled by the placement of the carriers 202, 302 on the front waist region 116 of the diaper 110, not by the spacing of the hook material on the material that forms the carriers 202, 302. By having the ability to extrude the hook material more densely on to the material that will form the carriers 202, 302 for the secondary first fastening components 126, efficiencies can be gained in the processing and converting of the secondary first fastening components 126. These efficiencies are further discussed below in the discussion exemplary methods 600, 700 of manufacturing a diaper 610, 710 having carriers 602a and 602b, 702a and 702b.
In another embodiment as shown in
As illustrated in
Providing the secondary first fastening components 126 spaced apart in such a configuration as shown in
As shown in the detailed views in
Additionally, in embodiments where the secondary first fastening component 126 is disposed directly on the strip 480 (such as shown in
Turning now to
As illustrated in
As shown in
Method 600 can also include coupling the carrier web 620 to the web 618 of primary second fastening component 676 to form a composite web 634, as shown in
As shown in
After the composite web 634 passes through the drive rollers 624, an adhesive station 640 can apply adhesive to a body facing surface 621 of the composite web 634, as shown in
Method 600 can also include cutting the carrier web 620 to form at least a first carrier 602a and cutting the web 618 including the primary second fastening component material 676 to form a strip 680. In some embodiments, cutting the carrier web 620 can include forming two carriers 602a and 602b by cutting the first carrier web portion 620a and the second carrier web portion 620b. Cutting the carrier web 620 and the web 618 including the primary second fastening component material 676 can be accomplished in a variety of ways. For example, cutting the carrier web 620 and the web 618 including the primary second fastening component material 676 can be accomplished simultaneously. Additionally or alternatively, cutting the carrier web 620 and the web 618 including the primary second fastening component material 676 can be accomplished by cutting the composite web 634.
In the exemplary method 600, the process of cutting the carrier web 620 to form at least a first carrier 602a and cutting the web 618 including the primary second fastening component material 676 to form a strip 680 will now be described. After passing the drive rollers 624, the composite web 634 can be transferred to the anvil roll 622. In the illustrated embodiment, the anvil roll 622 is a vacuum roll having an inner surface 642, an outer surface 644, and one or more vacuum holes 646 extending between the inner surface 642 and the outer surface 644 (as shown in
In the illustrated embodiment herein, the composite web 634 is fed to the anvil roll 622 at a slower linear speed (as indicated by V1 in
To cut the composite web 634, the method 600 can include a knife roll 648. The knife roll 648 can include one or more knife edges 650 (one shown in
Once the discrete composite web component 652 has been cut from the composite web 634 by knife roll 648, the discrete composite web component 652 will be transported at the surface speed of the anvil roll 622 to the absorbent assembly web 612. The discrete composite web component 652 is held to the outer surface 644 of the anvil roll 622 by the vacuum drawn through the vacuum holes 646 in the anvil roll 622, as depicted in
The reduced-vacuum regions 625 may be provided at an appropriate position such that the reduced-vacuum regions 625 generally align with the longitudinal lanes 626a, 626b of secondary first fastening component material 626. This alignment may be used to help protect the secondary first fastening component material 626 from unwanted deformation and/or to protect the outer surface 644 of the anvil roll 622. This may be especially advantageous where the secondary first fastening component material 626 includes a soft hook material (e.g., polyethylene or polypropylene). Although the anvil roll 622 is depicted in
The discrete composite web component 652 will travel at the same surface speed as the anvil roll 622 until it reaches the absorbent assembly web 612, where it can be coupled to the absorbent assembly web 612. In the embodiment depicted in
The coupled absorbent assembly web 612 and discrete composite web component 652 are then moved downstream for further processing. One such downstream process can include cutting the absorbent assembly web 612 to form an absorbent article 610 including the discrete composite web component 652, as shown in
For example, comparing the method 600 to form absorbent article 610 and the diaper 110 shown in
In some embodiments, the discrete composite web component 652 can be configured such that when the discrete composite web component 652 is coupled to the absorbent assembly web 612, the outermost longitudinal edges 606a, 606b of the first and second carriers 602a and 602b are disposed inboard of the longitudinal side edges 628 of the absorbent assembly web 612. In such a configuration, once the absorbent assembly web 612 is cut by the cut-off module 656, the absorbent article 610 could appear similar to the diaper 110 of
Furthermore, in some embodiments, the discrete composite web component 652 and the absorbent assembly web 612 can be configured such that when the discrete composite web component 652 is coupled to the absorbent assembly web 612, the portion of the longitudinal lane 626a of the secondary first fastening component material 626 on the first carrier 602a and the portion of the longitudinal lane 626b of the secondary first fastening component material 626 on the second carrier 602b can be positioned such that the outer longitudinal side edges 627a and 627b of the secondary first fastening component materials 626 are disposed outboard of the longitudinal side edges 628 of the absorbent assembly web 612. Once the absorbent article 610 is formed by cutting the absorbent assembly web 612 such that absorbent article 610 looks similar to diaper 110 of
As noted above, other components of the absorbent article 610 can be coupled to the absorbent assembly web 612 as is known in the art. For example, in one embodiment, the method 600 can further include coupling the back ears 122 (such as shown in
Turning now to
Method 700 can include providing a web 618 including the primary second fastening component material 676 and a carrier web 620 including a secondary first fastening component material 626 configured in longitudinal lanes 626a, 626b, as shown in
However, rather than coupling the carrier web 620 to the web 618 of primary second fastening component 676 to form a composite web 634 as in method 600 and shown in
Method 700 can also include cutting the carrier web 620 to form at least a first carrier 702a and cutting the web 618 including the primary second fastening component material 676 to form a strip 780. In some embodiments, cutting the carrier web 620 can include forming two carriers 702a and 702b by cutting the first carrier web portion 620a and the second carrier web portion 620b. Cutting the carrier web 620 and the web 618 including the primary second fastening component material 676 can be accomplished in a variety of ways. For example, cutting the carrier web 620 and the web 618 including the primary second fastening component material 676 can be accomplished simultaneously.
In method 700, after passing the drive rollers 624, an adhesive can be applied to the carrier web 620 (e.g., first carrier web portion 620a and second carrier web portion 620b) and the web 618 including the primary second fastening component material 676 by an adhesive station 740. In a preferred embodiment, the adhesive station 740 can apply an adhesive to the carrier web 620 (e.g., first carrier web portion 620a and second carrier web portion 620b) and the web 618 including the primary second fastening component material 676 through a slot-coat application. However, it is contemplated that the adhesive station 740 can apply an adhesive through a spray application, or other methods as known in the art.
The carrier web 620 and the web 618 can then be transferred to the anvil roll 622 and cut with a knife roll 648 including a knife edge 650. As shown in
The anvil roll 622 can be configured to properly control the carriers 702a and 702b independent from one another and independent from the strip 780. In the embodiment shown in
Similar to method 600 discussed above, method 700 can include aligning the first carrier web portion 620a and the second carrier web portion 620b with the anvil roll 622 such that the longitudinal lanes 626a, 626b of the secondary first fastening component material 626 on the first and second carrier web portions 620a, 620b align with reduced-vacuum regions 625. As shown in
Once the carrier web 620 and the web 618 including the primary second fastening component material 676 have been cut by the knife roll 648, the carriers 702a, 702b and the strip 780 can be transported at the surface speed of the anvil roll 622 to the absorbent assembly web 612. Similar to the discussion above with respect to method 600, the carriers 702a, 702b and the strip 780 can be coupled to the absorbent assembly web 612 by passing through a nip defined by the anvil roll 622 and the stomper roll 654, which helps the adhesive on the carriers 702a, 702b and the strip 780 (which can be applied by the adhesive station 740) couple the carriers 702a, 702b and the strip 780 to the absorbent assembly web 612, and specifically, to the outer cover of the absorbent assembly web 612. As previously noted, it is contemplated that in other embodiments, the carriers 702a, 702b and the strip 780 can be coupled to the absorbent assembly web 612 using other suitable bonding techniques.
Once the carriers 702a, 702b and the strip 780 are coupled to the absorbent assembly web 612, the carriers 702a, 702b, the strip 780, and the web 612 can be moved downstream for further processing, as shown in
For example, comparing the method 700 to form absorbent article 710 and the diaper 110 shown in
In some embodiments, the outermost longitudinal edges 706a, 706b of the first and second carriers 702a and 702b can be disposed inboard of the longitudinal side edges 628 of the absorbent assembly web 612. In such a configuration, once the absorbent assembly web 612 is cut by the cut-off module 656, the absorbent article 710 could appear similar to the diaper 110 of
Just as noted above with respect to method 600, other components of the absorbent article 710 can be coupled to the absorbent assembly web 612 as is known in the art. For example, in one embodiment, the method 700 can further include coupling the back ears 122 (such as shown in
Methods 600 and 700 can provide advantages in manufacturing an absorbent article 610, 710 with a primary fastening system and a secondary fastening system. As an example, providing the secondary first fastening component material 626 on a carrier web 620 that is different from the web 618 of material including the primary second fastening component material 676 that forms the strip 680 (in method 600), 780 (in method 700) can provide advantages in processing and converting operations of the secondary first fastening component material 626 on the carrier web 620 as compared to the cost of processing and converting if the secondary first fastening component material 626 was coupled directly to the web 618 that includes the primary second fastening component material 676. Specifically, if the secondary first fastening component material 626 is placed on web 618 including the primary second fastening component material 676, then the spacing between the secondary first fastening component material 626 (e.g., longitudinal lanes 626a, 626b) is controlled by the desired distance between the secondary first fastening components in the front waist region of the diaper. In comparison, if the secondary first fastening component material 626 is coupled to the carrier web 620, then the secondary first fastening component material 626 (e.g., longitudinal lanes 626a, 626b) that will ultimately form the secondary first fastening components on the diaper can be closer together on the carrier web 620 because the distance between the secondary first fastening components on the front waist region 116 of the diaper 110 is controlled by the placement of the carrier 602a, 602b (in method 600), 702a, 702b (in method 700) on to the front waist region 116, not by the spacing of the secondary first fastening component material 626 on the carrier web 620. As a result, producing the secondary first fastening component material 626 on a carrier web 620 as opposed to the web 618 that includes the primary second fastening component material 676 can yield savings in processing and converting costs of the raw materials used for the primary and secondary fastening systems.
In one suitable embodiment, the secondary fastening system (and in particular, the secondary first fastening components 126), the back ears 122 (and more particularly, the secondary second fastening component 178), and/or the outer cover 132 of the diaper 110 may be configured such that a peel force (i.e., a force applied by a user or the like of the diaper) needed to disengage the secondary first fastening components from the secondary second fastening components when the diaper is in the wear configuration is much higher than the peel force needed to disengage the secondary first fastening components from the outer cover when the diaper is in the folded configuration. As discussed, when the diaper 110 is provided in the folded configuration, the secondary first fastening components 126 engage the outer cover 132 such that the secondary first fastening components are not exposed to an outside of the diaper and such that the engagement of the secondary first fastening components with the outer cover helps keep the diaper in the folded configuration. However, if the bond between the secondary first fastening components 126 and the outer cover 132 is too great, when the diaper 110 is unfolded for use, the outer cover may tear, delaminate, etc. This may lead to residual pieces of the outer cover 132 remaining on the secondary first fastening components 126 (thus decreasing the effectiveness of the secondary first fastening components) as well as a torn diaper 110 which may leak, provide discomfort to a wearer, and/or which may be aesthetically unappealing to a user.
Accordingly, in some embodiments the components of the diaper 110 are configured such that less peel force is needed to disengage the secondary first fastening components 126 from the outer cover 132 to unfold the diaper than is needed to disengage the secondary first fastening components from the back ears 122 (and more particularly from the secondary second fastening components 178). Thus, during use of the diaper 110, less peel force is required to unfold the diaper for use than is needed to remove the diaper from the wear configuration. The lower peel force needed to unfold the diaper 110 makes the diaper easy to open for use without damaging the diaper while the higher peel force needed to remove the diaper from a wearer ensures the diaper remains securely fastened to the wearer over time notwithstanding the wearer crawling, walking, running, bending, etc.
In some embodiments, this may be accomplished by configuring the secondary first fastening components 126, the secondary second fastening components 178, and/or the outer cover 132 of the diaper 110 to achieve the desired engagement properties. For example, in embodiments where the secondary fastening system is a hook and loop fastening system (i.e., embodiments where the secondary first fastening components 126 comprise hook fasteners and the secondary second fastening components 178 comprise loop fasteners), the loop properties of the outer cover 132 may be reduced such that the bond between the hooks of the secondary first fastening components and the outer cover is less than the bond between the hooks of the secondary first fastening components and the loops of the secondary second fastening components. Further, in embodiments where the secondary fastening system is an adhesive system, the outer cover 132 may be modified to reduce its attachment properties in an area which engages the secondary first fastening components 126 when in the folded state. For example, in some embodiments a release coating may be applied to the outer cover 132 in the area which engages the secondary first fastening components 126 when in the folded state. In other embodiments, a polymer may be selected for the outer cover 132 which comprises the desired attachment properties, and/or one or more polymer additives (such as, e.g., euricimide) may be added to the outer cover 132. Still further, in embodiments where the secondary fastening system is a cohesive system, the outer cover 132 may be coated sparingly (or in some embodiments not at all) with a cohesive in order to lower the engagement between the secondary first fastening components 126 and the outer cover when in the folded configuration.
This may be more readily understood with reference to a particular example. In some embodiments, the secondary first fastening components 126 may be configured such that it is a Velcro® or similar polyethylene hook, the secondary second fastening components 178 may be configured such that it is made of NBL, and the outer cover 132 may be constructed such that it is an online laminated outer cover with diamond on diamond bonded spunbond facing. In such embodiments, less peel force is needed to disengage the secondary first fastening components 126 from the outer cover 132 of the diaper 110 when in the folded configuration than is needed to disengage the secondary first fastening components from the secondary second fastening components 178 when in the wear configuration. Further, in some embodiments less peel force is needed to disengage the secondary first fastening components 126 from the outer cover 132 than fastening components engage the outer cover of known diapers when in the folded configured.
An experiment was conducted (the “Diaper Opening Force Test”) to test the peel force needed to disengage the above described configuration of the secondary first fastening components 126 from the outer cover 132 as compared to the peel force needed to disengage known secondary first fastening components from the outer cover of a known diaper (i.e., the KC-Mexico diaper). The KC-Mexico diaper disposes each of the pair of fasteners very near a corresponding longitudinal edge of the absorbent core and a corresponding longitudinal fold line such that part of the pair of fasteners engages the outer cover of the KC-Mexico diaper when in the folded configuration (as discussed). The peel force needed to disengage the novel secondary first fastening components 126 described from the outer cover 132 of the diaper 110 was compared to the peel force needed to disengage the pair of fasteners from the outer cover of the KC-Mexico diaper. The results of the experiment showed that much less force was needed to disengage the secondary first fastening components 126 from the outer cover 132 than was needed to disengage the pair of fasteners from the outer cover of the KC-Mexico diaper, thus resulting in decreased tearing, delamination, etc., of the outer cover of the diaper.
The experiment was conducted using a MTS Sintech® tensile frame (serial no. 1G/040696/099) purchased from MTS System Corporation located at 14000 Technology Drive, Eden Prairie, Minn. (hereinafter “the machine”). The machine was configured with a 100 Newton D72795 load cell and upper and lower jaws one inch wide by three inches long. Each of these components were similarly purchased from MTS System Corporation. Each test specimen was outfitted (as will be more fully discussed) with two lengths of one inch wide Scotch® 234 masking tape manufactured and made commercially available by 3M.
Turning now to
At the center of the specimen 400, the masking tape 412 was folded into a loop 414 for engagement with an upper jaw 416. More particularly, a 1.25 inch loop 414 was formed at the center of the specimen 400 using the middle 2.5 inches of the masking tape 412. The above procedure was repeated with the second of the two pieces of masking tape 412 such that a second loop 414 was formed and disposed on at a substantially similar position on the back portion 404 of the specimen and configured to engage a lower jaw 418 of the machine.
A distance between the upper jaw 416 and the lower jaw 418 on the machine (i.e., the gauge length) was set at 1.5 inches. Next, the loops 414 provided on the front and back portions 402, 404 were clamped into the upper and lower jaws 416, 418, respectively. Specifically, approximately the outermost 0.75 inch of the loop 414 provided on the front portion 402 of the specimen 400 was clamped into the center of the upper jaw 416, and approximately the outermost 0.75 inch of the loop provided on the bottom side of the specimen was clamped into the center of the lower jaw 418. Each loop 414 was clamped into the respective jaw 416, 418 without breaking the bond between the front and back sides of the specimen (e.g., without disengaging the secondary first fastening component 126 from the outer cover 132) and without disengaging the masking tape 412 from the outer cover of the specimen.
Next, the machine was operated such that the upper jaw 416 traveled upward at a speed of 305 millimeters per minute until the front side of the folded specimen 400 became disengaged from the back side of the folded specimen (e.g., until the secondary first fastening components 126 became disengaged from the outer cover 132). Data was then recorded on a computer for force versus displacement (travel distance of the upper jaw 416) using software called TestWorks® v4.12C provided by MTS System Corporation. The force was recorded to the nearest 0.1 grams-force (gf). The peak load (e.g., the highest force reading) for each tested specimen is thus representative of a typical peel force needed to unfold each tested specimen (e.g., disengage the secondary first fastening components 126 from the outer cover 132).
The above described experiment was performed for a plurality of specimens 400 of the diaper 110 comprising the above described properties for each of the secondary first fastening components 126 and the outer cover 132, as well as a plurality of specimens of the KC-Mexico diaper. The experiment revealed that the peak loads (i.e., a load indicative of a peel force needed to unfold the product) for the KC-Mexico diaper were much higher than the peak loads experienced by the diaper 110 configured as described. More specifically, in the experiment ten specimens of each product were tested with an average peak load of the ten KC-Mexico diapers being 135.5 gf with a standard deviation of 26.1 gf, and an average peak load of the ten diapers according to the disclosure being 91.4 gf with a standard deviation of 13.5 gf. Further, a maximum of the peak loads measured for the KC-Mexico diaper was 176.75 gf, while a maximum of the peak loads measured for the diaper 110 was 116.6 gf.
Table 1 below is the results of the Diaper Opening Force Test for the KC-Mexico diaper and for the product according to the present disclosure.
In some suitable embodiments, the secondary first fastening components 126 may not engage the back waist region (e.g., outer cover 132, ears 122, etc.) with any force. For example, in some embodiments (and as discussed) the secondary first fastening components 126 may comprise one or more loop fasteners, and the secondary second fastening components 178 may comprise hook fasteners. In such embodiments, the hook fasteners of the secondary second fastening components 178 may be folded over before the diaper 110 is folded along the lateral fold line 144 (as discussed in connection with the various folding processes described above). Accordingly, when the diaper 110 is ultimately folded along lateral fold line 144, the loop fasteners of the secondary first fastening components may engage the back waist portion with little or no force. In such embodiments, the Diaper Opening Test would indicate a very small peak force or even a zero peak force is needed to unfold the diaper.
Accordingly, because the KC-Mexico diaper experienced much higher peak loads before the pair of fasteners came disengaged from the outer cover than the peak loads required to disengage the secondary first fastening components 126 from the outer cover 132 of the diaper 110, the KC-Mexico diaper thus requires much more force to unfold the product than does the diaper according to aspects of this disclosure. Accordingly, a user of the diaper 110 may more readily unfold the diaper 110 during use without, e.g., risking tearing or delaminating the outer cover 132 of the diaper.
Continuing with
In one embodiment, the secondary first fastening components 126 (i.e., the hook fasteners of the illustrated embodiment) on the front portion 116 of the diaper 110 each have a relatively low stiffness at least in the longitudinal direction 112 of the diaper to facilitate decreased red marking of and discomfort to the wearer of the diaper. As used herein, the stiffness of the secondary first fastening components 126 refers generally to the resistance of each component to deflection or deformation (e.g., bending) when acted on by an applied force. For example, in one suitable embodiment, the stiffness may be a Gurley stiffness as determined in a Gurley Stiffness Test. In other embodiments the stiffness may be an edge stiffness as determined in an Edge Stiffness Test.
Gurley Stiffness Test
A Gurley Stiffness Test is commonly used to determine the stiffness of a test specimen (such as, e.g., the secondary first fastening component 126) with respect to a bending moment produced by a force that is directed perpendicular to the plane substantially defined by the length and width of the specimen being tested. A description of a Gurley Stiffness Test is set forth in TAPPI Standard Test T543 om-94 (Bending Resistance of Paper (Gurley type tester). One suitable testing apparatus for conducting the Gurley Stiffness Test is a Gurley Digital Stiffness Tester, Model 31644 manufactured by Teledyne Gurley, a business having offices in Troy, N.Y.
For purposes of the present disclosure, the stated Gurley stiffness values are those that would be generated by a standard sized sample (i.e., 1 inch wide by 3.5 inches long) using the Gurley Digital Stiffness Tester. Accordingly, the readings from the Tester are appropriately converted to the stiffness of a standard sized sample (i.e., 1 inch wide by 3.5 inches long), and are reported in terms of milligrams (mg) of force.
In general, the Gurley Digital Stiffness Tester consists of a pendulum with slots for attaching various weights. The specimen to be tested presses the pendulum to the right and to the left resulting in two readings. The readings are positively correlated with a specimen's stiffness. The two readings are then averaged and multiplied by a factor. This factor is determined by the specimen size, the distance from the center pivot, and the weight used on the pendulum. Methodology of the Gurley Stiffness Test is set forth below.
For purposes of the present disclosure, test specimens are prepared, e.g., taken from a larger sample or product, by cutting the specimen to have its length in the longitudinal or machine direction of the product. As an example, for the present disclosure where the secondary first fastening components (e.g., hook fasteners) are being tested, the specimens are cut from the diaper to include the fastener along with the material to which it is attached, e.g., the outer cover of the diaper. Each specimen should be cut to 12 mm wide by 25 mm long±1 mm (or 0.5 inches by 1 inch±0.04 inches).
To conduct the Gurley Stiffness Test using the Gurley Digital Stiffness Tester, the base of the instrument is first leveled by adjusting the leveling screw until the level's bubble is centered and the pendulum's pointer indicates zero. After turning the power on, the specimen is used to determine the appropriate weight and the weight position on the pendulum to obtain a reading between 2 and 6 on the scale/display. The switches are set to correspond to the weight being used, the weight's position on the pendulum, the width of the specimen being tested, and the length of the specimen.
For each specimen, the specimen strip is centered over the pendulum such that 6.4 mm±1 mm (or 0.25 inches±0.04 inches) overlaps the top of the pendulum and 6.4 mm±1 mm (or 0.25 inches±0.04 inches) is held in the jaws of the Tester. The system is reset so that the display reads 00-000-00. The Motor-Direction switch is operated to engage the clamp arm to press the specimen against the pendulum. Both a left reading and a right reading are taken, and an average reading is determined. The SELECT button on the Tester is then pressed to obtain the stiffness (in milligrams) calculation and the stiffness is recorded. The aforementioned steps are repeated for each test specimen in the sample group.
EXAMPLESecondary first fastening components from two different absorbent products were subjected to the Gurley Stiffness Test to assess the relative Gurley stiffness of each. The first product was the KC-Mexico diaper, which has fastening components being hook fasteners and being made of polypropylene. Each specimen had the following test conditions: weight 25 g, and weight position 4″; and measurements: width 0.5″, and length 1″. The second product was made in accordance with the present disclosure with the fastening components being hook fasteners and being made of polyethylene. Each specimen had the following test conditions: weight 25 g, and weight position 2″; and measurements: width 0.5″, and length 1″. Ten specimens of each product were tested. As used herein when referring to the Gurley Stiffness test, “length” generally refers to a direction in the longitudinal direction of the product, and “width” generally refers to a dimension in the lateral direction of the product. Further, “weight” and “weight position” generally refer to test conditions which indicate how much force is attached to the pendulum and at what position during the test.
Table 2 below is the results of the Gurley Stiffness Test for the KC-Mexico diaper and Table 3 is the results for the product according to the present disclosure.
The tested fastening components from the KC-Mexico diaper had an average stiffness of 207.94 mg whereas the tested fastening components from the present disclosure product had an average stiffness of 136.48 mg. Additionally, the tested fastening components from the KC-Mexico diaper ranged from a minimum stiffness of 186.26 mg to a maximum stiffness of 244.64 mg. The tested fastening components from the present disclosure product ranged from a minimum stiffness of 116.76 mg to a maximum stiffness of 180.70 mg. In other words, the minimum stiffness (186.26 mg) of the tested components of the KC-Mexico diaper was greater than the maximum stiffness (180.70 mg) of the tested fastening components from the present disclosure product. Put differently, every tested fastening component from the present disclosure product had a Gurley stiffness of less than 185 mg.
To this end, in one embodiment the secondary first fastening component 126, and more particularly the secondary hook fastener on the front portion 116 of the diaper 110 as in the illustrated embodiment, has a Gurley stiffness according to the Gurley Stiffness Test of less than 185 mg, more suitably less than 170 mg, even more suitably less than 160 mg, still more suitably less than 150 mg, and still more suitably less than 140 mg. In another embodiment the secondary first fastening component 126, and more particularly the secondary hook fastener on the front portion 116 of the diaper 110 as in the illustrated embodiment, has an average Gurley stiffness according to the Gurley Stiffness Test of less than 180 mg for a sample size of at least 10 specimens, more suitably less than 170 mg, even more suitably less than 160 mg, still more suitably less than 150 mg, and still more suitably less than 140 mg. It is understood that in other embodiments the Gurley stiffness, and/or the average Gurley stiffness of the secondary first fastening component 126 may be even less than the ranges set forth above and remain within the scope of the disclosure.
Edge Stiffness Test
An Edge Stiffness Test determines the edge stiffness of a test specimen 500 (such as, e.g., the secondary first fastening component 126), and more particularly it measures the amount of force, in grams (grams-force, or gf), required to buckle or bend upon applying a longitudinal force against an edge of the specimen. This is indicative, for example, of the manner in which a force would be applied by a wearer to the secondary first fastening components 126 of the diaper 110 when the wearer bends over at the waist.
Turning now to
One suitable testing apparatus for conducting the Edge Stiffness Test is an MTS Sintech tensile frame 500S manufactured by MTS System Corporation, a business having offices in Eden Prairie, Minn. Additional instruments used to conduct the Edge Stiffness Test include a load cell 100 Newton D86201, an upper fixture having a upper jaw 516 measuring 1″ long and 3″ wide, and a low fixture stainless steel platen 520 having a diameter measuring 3.5″ (all manufactured by MTS System Corporation). Also used is a thickness measurement device such as a Sony Digital Indicator U30A equipped with a 0.05 psi platen, manufactured by Sony Corporation of America, a business having offices in New York, N.Y.
To conduct the Edge Stiffness Test for the purposes of the present disclosure, specimens 500 are cut to have a width of 15 mm in the lateral direction 114 of the product, such as the diaper 110 of the illustrated embodiment, and a length of 40 mm in the longitudinal direction 112 of the product. The thickness of each specimen 500 is measured using the thickness measurement device with a 0.05 psi platen to the nearest 0.001 mm. The distance between the lower platen 520 and the bottom of the upper jaw 516 is set at 10 mm and the specimen 500 is placed in the upper jaw with the specimen oriented lengthwise. The lower edge of the specimen 500 is in slight contact with the flat surface of the lower platen 520.
The upper jaw 516 is activated to move downward toward the lower platen 520 at a speed of 6.35 mm/min. (0.25 inches/min.) to longitudinally compress the specimen 500 until the force drops from the peak and levels off. Test data of the compression force vs. compression distance (e.g., downward travel distance of the upper jaw 516) is recorded on a PC using software having the trade name TestWorks V4.12C provided by MTS System Corporation. The compression force is reported to the nearest 0.1 grams-force (gf). The peak compression load (in gf) for each specimen 500 tested is determined using this software. The peak compression stress in gf/mm2 is calculated by dividing the peak compression load in gf by the cross sectional area in mm2.
EXAMPLESecondary first fastening components from two different absorbent products were subjected to the Edge Stiffness Test to assess the relative edge stiffness of each. The first product was the KC-Mexico diaper having hook fasteners made of polypropylene. The second product was a diaper 110 made in accordance with the present disclosure with the secondary first fastening components 126 being hook fasteners and being made of polyethylene. Five specimens 500 of each product were tested.
Table 4 below is the results of the Edge Stiffness Test for the KC-Mexico diaper and Table 5 is the results for the product according to the present disclosure. The Peak Load is the edge stiffness, in grams-force (gf).
Trend line A indicates that the compression force required to bend or buckle the specimen 500 from the KC-Mexico diaper increases until the specimen buckled at a peak compression force of 110.7 grams-force. After the peak compression load, the compression force required to further bend the specimen 500 decreased asymptotically towards approximately 80 grams-force. Accordingly, it required more force to compress the edge of a specimen 500 from the KC-Mexico diaper than it did to compress the edge of a specimen from a product made according to present disclosure. Therefore, it can be concluded that the edge stiffness of the secondary first fastening component 126 of the present disclosure product was less stiff than that of the KC-Mexico diaper.
Accordingly, in one embodiment the secondary first fastening component 126, and more particularly the secondary hook fastener on the front portion 116 of the diaper 110 as in the illustrated embodiment, has an edge stiffness according to the Edge Stiffness Test of less than 100 grams-force, more suitably less than 90 grams-force, even more suitably less than 80 grams-force, still more suitably less than 70 grams-force, and still more suitably less than 60 grams-force. In other embodiments it is less than 50 grams-force.
In another embodiment the secondary first fastening component 126, and more particularly the secondary hook fastener on the front portion 116 of the diaper 110 as in the illustrated embodiment, has an average edge stiffness according to the Edge Stiffness Test of less than 80 grams-force for a sample size of at least 5 specimens, more suitably less than 70 grams-force, even more suitably less than 60 grams-force, and still more suitably less than 50 grams-force. It is understood that in other embodiments the edge stiffness and/or the average edge stiffness of the secondary first fastening component 126 may be even less than the ranges set forth above and remain within the scope of the disclosure.
With reference to Tables 4 and 5, the KC-Mexico diaper specimens 500 had an average peak load of 126.7 grams-force whereas the present disclosure specimens had an average peak load of 48.9 grams-force. Another embodiment of the present disclosure has an average peak load of less than 90 grams-force based on a sample size of at least 5 samples. Another embodiment of the present disclosure with a sample size of at least 5 samples has an average peak load of less than 80 grams-force. Yet another embodiment of the present disclosure with a sample size of at least 5 samples has an average peak load of less than 70 grams-force. Yet another embodiment of the present disclosure with a sample size of at least 5 samples has an average peak load of less than 60 grams-force.
With continued reference to Tables 4 and 5, the KC-Mexico diaper specimens 500 shown in Table 4 ranged from a minimum peak load of 100.1 grams-force to a maximum peak load of 158.2 grams-force. The present disclosure specimens 500 shown in Table 5 ranged from a minimum peak load of 38.5 grams-force to a maximum peak load of 68.2 grams-force. In other words, every specimen 500 in the present disclosure sample had a peak load of less than 100 grams-force.
Thus, in view of either one of the Gurley Stiffness Test and the Edge Stiffness Test, particularly as used in the above Examples, it is evident that the secondary first fastening components 126 are less stiff than secondary first fastening components of the KC-Mexico diaper. As used on the diaper 110 described herein, such a reduced stiffness increases comfort for the wearer and reduces red marks that may irritate the skin.
When introducing elements of the present invention or the preferred embodiment(s) thereof, the articles “a”, “an”, “the”, and “said” are intended to mean that there are one or more of the elements. The terms “comprising,” “including”, and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.
As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims
1. An absorbent article including a longitudinal axis and a lateral axis, the absorbent article comprising:
- an absorbent assembly comprising a liquid impermeable outer cover, a liquid permeable top sheet, and an absorbent body disposed between the outer cover and the top sheet, the absorbent assembly including a front waist region, a rear waist region, and a crotch region extending between the front waist region and the rear waist region;
- a pair of ears extending transversely outward from opposite sides of the absorbent assembly;
- a fastening system configured to attach the rear waist region to the front waist region to define a wear configuration of the absorbent article, the fastening system comprising a primary fastening system and a secondary fastening system, the primary fastening system including at least one primary first fastening component and a primary second fastening component, the secondary fastening system including at least one secondary first fastening component and at least one secondary second fastening component; and
- a strip coupled to the outer cover, the strip including the primary second fastening component;
- wherein the at least one secondary first fastening component is coupled to a first carrier, and
- wherein the first carrier is coupled directly to the outer cover proximate the front waist region.
2. The absorbent article of claim 1, wherein the first carrier is directly coupled to the strip.
3. The absorbent article of claim 2, wherein an outermost longitudinal edge of the first carrier is disposed outboard of the outer edge of the strip.
4. The absorbent article of claim 1, wherein the first carrier is directly coupled to the outer cover such that an innermost longitudinal edge of the first carrier is disposed outboard of an outer edge of the strip.
5. The absorbent article of claim 1, wherein the secondary fastening system comprises two secondary first fastening components, the two secondary first fastening components including a left secondary first fastening component and a right secondary first fastening component.
6. The absorbent article of claim 5, wherein the pair of ears are disposed in the rear waist region and include a left ear and a right ear and the secondary fastening system further comprises two secondary second fastening components including a left secondary second fastening component and a right secondary second fastening component, the left secondary second fastening component being disposed on the left ear and the right secondary second fastening component being disposed on the right ear, wherein the left secondary first fastening component is coupled to the first carrier and the right secondary first fastening component is coupled to a second carrier.
7. The absorbent article of claim 6, wherein the left and right secondary first fastening components comprise hook materials and the left and right secondary second fastening components comprise loop materials.
8. The absorbent article of claim 6, wherein the first carrier and the second carrier are each coupled directly to the strip.
9. The absorbent article of claim 6, wherein an innermost longitudinal edge of the first carrier is disposed inboard of a first outer edge of the strip and an innermost longitudinal edge of the second carrier is disposed inboard of a second outer edge of the strip, the second outer edge of the strip being opposite from the first outer edge of the strip.
10. The absorbent article of claim 6, wherein the first carrier is directly coupled to the outer cover such that an innermost longitudinal edge of the first carrier is disposed outboard of a first outer edge of the strip and the second carrier is directly coupled to the outer cover such that an innermost longitudinal edge of the second carrier is disposed outboard of a second outer edge of the strip, the second outer edge of the strip being opposite from the first outer edge of the strip.
11. An absorbent article including a longitudinal axis and a lateral axis, the absorbent article comprising:
- an absorbent assembly comprising a liquid impermeable outer cover, a liquid permeable top sheet, and an absorbent body disposed between the outer cover and the top sheet, the absorbent assembly including a front waist region with a front waist edge, a rear waist region with a rear waist edge, a crotch region extending between the front waist region and the rear waist region, a first longitudinal side edge and a second longitudinal side edge opposite from the first longitudinal side edge, the first longitudinal side edge and the second longitudinal side edge each extending from the front waist edge to the rear waist edge; and
- a fastening system configured to attach the rear waist region to the front waist region to define a wear configuration of the absorbent article, the fastening system comprising a primary fastening system and a secondary fastening system; the primary fastening system including at least one primary first fastening component and at least one primary second fastening component, the at least one primary second fastening component included on a strip coupled to the outer cover; and the secondary fastening system including at least one secondary first fastening component and at least one secondary second fastening component, the at least one secondary first fastening component including an inner longitudinal side edge and an outer longitudinal side edge, the at least one secondary first fastening component is directly coupled to the strip or directly coupled to a first carrier that is directly coupled to the strip, the outer longitudinal side edge of the at least one secondary first fastening component is disposed outboard of the first longitudinal side edge of the absorbent assembly.
12. The absorbent article of claim 11, wherein the at least one secondary first fastener component is directly coupled to the strip.
13. The absorbent article of claim 11, wherein the strip includes an upper edge and a lower edge, the at least one secondary first fastening component includes a top edge and a bottom edge, and wherein the top edge of the at least one secondary first fastening component is closer to the lateral axis than is the upper edge of the strip, and wherein the lower edge of the strip is closer to the lateral axis than is the bottom edge of the secondary first fastening component.
14. The absorbent article of claim 12, wherein the strip includes a first outer edge and a second outer edge, the first outer edge of the strip extending outboard of the first longitudinal side edge of the absorbent assembly, and wherein the outer longitudinal side edge of the at least one secondary first fastening component does not extend to the first outer edge of the strip.
15. The absorbent article of claim 11, wherein the at least one secondary first fastener component is coupled to the first carrier that is directly coupled to the strip.
16. The absorbent article of claim 15, wherein the first carrier includes an upper edge and a lower edge, the at least one secondary first fastening component includes a top edge and a bottom edge, and wherein the top edge of the at least one secondary first fastening component is closer to the lateral axis than is the upper edge of the first carrier, and wherein the lower edge of the first carrier is closer to the lateral axis than is the bottom edge of the secondary first fastening component.
17. The absorbent article of claim 15, wherein the first carrier includes an outermost longitudinal edge, the outermost longitudinal edge extending outboard of the first longitudinal side edge of the absorbent assembly, and wherein the outer longitudinal side edge of the at least one secondary first fastening component does not extend to the outermost longitudinal edge of the first carrier.
18. The absorbent article of claim 11, wherein the secondary fastening system comprises two secondary first fastening components, the two secondary first fastening components including a left secondary first fastening component and a right secondary first fastening component.
19. The absorbent article of claim 18, wherein the left secondary first fastening component and the right secondary first fastening are directly coupled to the strip, and wherein an outer longitudinal side edge of the left secondary first fastening component is disposed outboard of the first longitudinal side edge of the absorbent assembly and an outer longitudinal side edge of the right secondary first fastening component is disposed outboard of the second longitudinal side edge of the absorbent assembly.
20. The absorbent assembly of claim 18, wherein the left secondary first fastening component is coupled to the first carrier and the right secondary first fastening is coupled to a second carrier, first carrier being directly coupled to the strip and the second carrier being directly coupled to the strip, and wherein an outer longitudinal side edge of the left secondary first fastening component is disposed outboard of the first longitudinal side edge of the absorbent assembly and an outer longitudinal side edge of the right secondary first fastening component is disposed outboard of the second longitudinal side edge of the absorbent assembly.
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Type: Grant
Filed: Feb 28, 2014
Date of Patent: Apr 11, 2017
Patent Publication Number: 20150032079
Assignee: Kimberly-Clark Worldwide, Inc. (Neenah, WI)
Inventors: David John Enz (Neenah, WI), Robert Lee Popp (Greenville, WI), David Fleger Bishop (Appleton, WI), Wendy Lynn VanDyke (Appleton, WI), Sara Jane Wille Stabelfeldt (Appleton, WI), Catherine Marguerite Hancock-Cooke (Neenah, WI)
Primary Examiner: Michele M Kidwell
Application Number: 14/193,039
International Classification: A61F 13/15 (20060101); A61F 13/20 (20060101); A61F 13/56 (20060101); A61F 13/62 (20060101);